<template>
	<view class="container">
		<Header :isBack="true">
			<block slot="content">{{title}}</block>
		</Header>
		<!-- 空白页 -->
		<view v-if="!hasLogin" class="empty">
			<view class="empty-tips">
				尚未登录
				<view class="navigator" @click="navToLogin">去登陆></view>
			</view>
		</view>
		<view v-else>
			<view class="empty" v-if="empty == true">
				<image src="/pages6/static/images/empty_cart.png" mode="aspectFit"
					style="width: 149upx;height:149upx;margin:0 auto;"></image>
				<view class="" style="color:#a7aaaa;font-size: 28upx;padding-top: 52upx;padding-bottom: 150upx;">
					购物车暂无商品
				</view>
				<view class="empty-go">
					<navigator class="navigator" url="/pages6/pages/product/cate">去逛逛></navigator>
				</view>
			</view>
			<!-- 列表 -->
			<view class="" v-else>
				<view class="cart-list">
					<block v-for="(item, index) in cartList" :key="item.id">
						<view class="cart-item" :class="{'b-b': index!==cartList.length-1}">
							<view class="image-wrapper">
								<image :src="item.cover_ico" :class="[item.loaded]" mode="aspectFit" lazy-load
									@load="onImageLoad('cartList', index)" @error="onImageError('cartList', index)"
									style="opacity: 1;"></image>
								<view class="yticon icon-xuanzhong2 checkbox" :class="{checked: item.checked}"
									@click="check('item', index)"></view>
							</view>
							<view class="item-right">
								<text class="clamp title">{{item.product_name}}</text>
								<!-- <text class="attr">{{item.attr_val}}</text> -->
								<text class="price">¥{{item.price}}</text>
								<uni-number-box class="step" :min="1" :max="item.stock"
									:value="item.number>item.stock?item.stock:item.number"
									:isMax="item.number>=item.stock?true:false" :isMin="item.number===1" :index="index"
									@eventChange="numberChange"></uni-number-box>
							</view>
							<text class="del-btn yticon icon-fork" @click="deleteCartItem(index)"></text>
						</view>
					</block>
				</view>
				<!-- 底部菜单栏 -->
				<view class="action-section">
					<view class="checkbox">
						<image :src="allChecked?'/static/selected.png':'/static/select.png'" mode="aspectFit"
							@click="check('all')"></image>
						<view class="clear-btn" :class="{show: allChecked}" @click="clearCart">
							清空
						</view>
					</view>
					<view class="total-box">
						<text class="price">¥{{total}}</text>
						<!-- <text class="coupon">
							已优惠
							<text>74.35</text>
							元
						</text> -->
					</view>
					<button type="primary" class="no-border confirm-btn" @click="createOrder">去结算</button>
				</view>
			</view>
		</view>

		<uni-popup ref="alertDialog" type="dialog">
			<uni-popup-dialog :type="msgType" title="" content="确定要清空购物车?" @confirm="dialogConfirm">

			</uni-popup-dialog>
		</uni-popup>
		<BottomTabbar :selected="2"></BottomTabbar>
	</view>
</template>

<script>
	import {
		mapState
	} from 'vuex';
	import BottomTabbar from '@/pages6/components/bottom-tabbar/shop-bottom-tabbar.vue';
	import uniNumberBox from '@/pages6/components/uni-number-box.vue'
	export default {
		components: {
			uniNumberBox,
			BottomTabbar
		},
		data() {
			return {
				title: '购物车',
				msgType: 'info',
				total: 0, //总价格
				allChecked: false, //全选状态  true|false
				empty: true, //空白页现实  true|false
				cartList: [],
				dataObj: {}
			};
		},
		// 页面生命周期，下拉刷新后触发
		onPullDownRefresh() {
			//判断是否登录
			let result = this.$api.isLogin();
			if (result === false) {
				return false;
			}

			this.loadData()

			// 停止下拉刷新
			setTimeout(function() {
				uni.stopPullDownRefresh()
			}, 500)
		},
		onLoad() {
			if (this.hasLogin) {
				let dataObj = {
					token: uni.getStorageSync('token'),
					cate: uni.getStorageSync('cate')
				}

				this.dataObj = dataObj
				this.loadData();
			}
		},
		watch: {
			//显示空白页
			cartList(e) {
				let empty = e.length === 0 ? true : false;
				if (this.empty !== empty) {
					this.empty = empty;
				}
			}
		},
		computed: {
			...mapState(['hasLogin'])
		},
		methods: {
			//请求数据
			async loadData() {

				let res = await this.$myRequest({
					url: '/cartList',
					data: this.dataObj,
					methods: 'POST'
				})

				let cartList = res.data.data.map(item => {
					item.checked = true;
					return item;
				});
				this.cartList = cartList;
				this.calcTotal(); //计算总价

			},
			//监听image加载完成
			onImageLoad(key, index) {
				this.$set(this[key][index], 'loaded', 'loaded');
			},
			//监听image加载失败
			onImageError(key, index) {
				this[key][index].image = '/static/errorImage.jpg';
			},
			navToLogin() {
				uni.reLaunch({
					url: '/pages/login/login'
				})
			},
			//选中状态处理
			check(type, index) {
				if (type === 'item') {
					this.cartList[index].checked = !this.cartList[index].checked;
				} else {
					const checked = !this.allChecked
					const list = this.cartList;
					list.forEach(item => {
						item.checked = checked;
					})
					this.allChecked = checked;
				}
				this.calcTotal(type);
			},
			//数量
			numberChange(data) {
				this.cartList[data.index].number = data.number;
				this.calcTotal();
			},
			//删除
			deleteCartItem(index) {
				let list = this.cartList;
				let row = list[index];
				let id = row.id;

				this.cartList.splice(index, 1);
				this.calcTotal();
				uni.hideLoading();
			},
			//清空
			clearCart() {
				this.$refs.alertDialog.open()
			},
			//确定清空购物车
			async dialogConfirm() {
				let res = await this.$myRequest({
					url: '/clearCart',
					data: this.dataObj,
					methods: 'POST'
				})

				this.cartList = []
				this.$api.msg(res.data.msg)
			},
			//计算总价
			calcTotal() {
				let list = this.cartList;
				if (list.length === 0) {
					this.empty = true;
					return;
				}
				let total = 0;
				let checked = true;
				list.forEach(item => {
					if (item.checked === true) {
						total += item.price * item.number;
					} else if (checked === true) {
						checked = false;
					}
				})
				this.allChecked = checked;
				this.total = Number(total.toFixed(2));
			},
			//创建订单
			async createOrder() {
				let list = this.cartList;
				let goodsData = [];
				list.forEach(item => {
					if (item.checked) {
						goodsData.push({
							// attr_val: item.attr_val,
							id: item.product_id,
							number: item.number
						})
					}
				})

				this.dataObj.data = goodsData
				let res = await this.$myRequest({
					url: '/order',
					data: this.dataObj,
					methods: 'POST'
				})

				this.$api.msg('去创建订单');

				setTimeout(() => {
					uni.navigateTo({
						url: '/pages6/pages/order/createOrder?tag=' + res.data.data
					})
				}, 1000)
			}
		}
	}
</script>
<style>
	page {
		background-color: #f7f7f7;
		font-size: $font-base;
	}
</style>
<style lang='scss'>
	.container {
		// #ifdef APP-PLUS
		padding-top: 176rpx;
		// #endif

		// #ifdef H5
		padding-top: 124rpx;
		// #endif

		// #ifdef MP-WEIXIN
		padding-top: 158rpx;
		// #endif

		/* 空白页 */
		.empty {
			position: fixed;
			left: 0;
			top: 0;
			width: 100%;
			height: 100vh;
			padding-bottom: 100upx;
			display: flex;
			justify-content: center;
			flex-direction: column;
			align-items: center;
			background: #fff;

			image {
				width: 240upx;
				height: 160upx;
				margin-bottom: 30upx;
			}

			.empty-tips {
				display: flex;
				font-size: $font-sm+2upx;
				color: $font-color-disabled;

				.navigator {
					color: $uni-color-primary;
					margin-left: 16upx;
				}
			}

			.empty-go {
				width: 297upx;
				height: 84upx;
				display: flex;
				align-items: center;
				justify-content: center;
				border: solid 2upx #f3461e;
				border-radius: 42upx;
				font-size: 30upx;
				color: #f3461e;
				letter-spacing: 2upx;
			}
		}
	}

	/* 购物车列表项 */
	.cart-item {
		display: flex;
		position: relative;
		padding: 30upx 40upx;
		background-color: #fff;

		.image-wrapper {
			width: 230upx;
			height: 230upx;
			flex-shrink: 0;
			position: relative;

			image {
				border-radius: 8upx;
			}
		}

		.checkbox {
			position: absolute;
			left: -16upx;
			top: -16upx;
			z-index: 8;
			font-size: 44upx;
			line-height: 1;
			padding: 4upx;
			color: $font-color-disabled;
			background: #fff;
			border-radius: 50px;
		}

		.item-right {
			display: flex;
			flex-direction: column;
			flex: 1;
			overflow: hidden;
			position: relative;
			padding-left: 30upx;

			.title,
			.price {
				font-size: $font-base + 2upx;
				color: $font-color-dark;
				height: 40upx;
				line-height: 40upx;
			}

			.attr {
				font-size: $font-sm + 2upx;
				color: $font-color-light;
				height: 50upx;
				line-height: 50upx;
			}

			.price {
				height: 50upx;
				line-height: 50upx;
			}
		}

		.del-btn {
			padding: 4upx 10upx;
			font-size: 34upx;
			height: 50upx;
			color: $font-color-light;
		}
	}

	/* 底部栏 */
	.action-section {
		/* #ifdef H5 */
		margin-bottom: 100upx;
		/* #endif */
		position: fixed;
		left: 30upx;
		bottom: 182upx;
		z-index: 95;
		display: flex;
		align-items: center;
		width: 690upx;
		height: 100upx;
		padding: 0 30upx;
		background: rgba(255, 255, 255, .9);
		box-shadow: 0 0 20upx 0 rgba(0, 0, 0, .5);
		border-radius: 16upx;

		.checkbox {
			height: 52upx;
			position: relative;

			image {
				width: 52upx;
				height: 100%;
				position: relative;
				z-index: 5;
			}
		}

		.clear-btn {
			position: absolute;
			left: 26upx;
			top: 0;
			z-index: 4;
			width: 0;
			height: 52upx;
			line-height: 52upx;
			padding-left: 38upx;
			font-size: $font-base;
			color: #fff;
			background: $font-color-disabled;
			border-radius: 0 50px 50px 0;
			opacity: 0;
			transition: .2s;

			&.show {
				opacity: 1;
				width: 120upx;
			}
		}

		.total-box {
			flex: 1;
			display: flex;
			flex-direction: column;
			text-align: right;
			padding-right: 40upx;

			.price {
				font-size: $font-lg;
				color: $font-color-dark;
			}

			.coupon {
				font-size: $font-sm;
				color: $font-color-light;

				text {
					color: $font-color-dark;
				}
			}
		}

		.confirm-btn {
			padding: 0 38upx;
			margin: 0;
			border-radius: 100px;
			height: 76upx;
			line-height: 76upx;
			font-size: $font-base + 2upx;
			background: $uni-color-primary;
			box-shadow: 1px 2px 5px rgba(217, 60, 93, 0.72)
		}
	}

	/* 复选框选中状态 */
	.action-section .checkbox.checked,
	.cart-item .checkbox.checked {
		color: $uni-color-primary;
	}
</style>
